Living in the area I am familiar with a couple of current events. Just yesterday the Somolian president was holding a conference at The Ohio State
University. A townhall meeting discussing a proposed Stand Your Ground Law was being held yesterday or today. Probably not related at all, but food
for thought. Columbus does have the second largest Somoli population in the nation......

I've been listening to a real scanner since around 8:00 tonight. Currently SWAT and the bomb squad are doing a detailed search inside the building.
The first floor was cleared about ten minutes ago. They have already cleared the exterior of the building. Nothing unusual has been found so far.

No one was injured and there has been no property damage reported. Witnesses saw a man throw something in a sewer just before the explosion was
reported. CCTV footage from the AEP building and federal courthouse across the street was reviewed but nothing unusual was seen. A man who was on the
top floor of an adjacent parking garage was detained and questioned, but I haven't heard anything else about that. A woman called in to the radio
room around 10 or so claiming to know who was responsible. Police were going to determine if she had credible information and respond to interview her
if so. I haven't heard anything more about her either.

Police still have a large radius blocked off around the headquarters building while they clear the building.

I have not been listening to the scanners and have just come upon this thread now. M-40's could be referring to a firework that is now illegal
pretty much everywhere in the US. I used to use them and m-80's in my younger years to blow crap up. Very loud, more than 50mg of powder is packed
into them and they make a lot of powder smell when lit.
If they aren't talking about the M40 guns that people here have mentioned then it may have been some wisecrackers with some of these fireworks.

I live 2 or so hours from Columbus, but have a few friends there. I may ask. To me though it sounds like someone just threw something in the sewer to
cause a commotion and succeeded. Firework (maybe they are saying m40 but meaning m80), gunshot, or maybe a guy with meth lab or plastic bottle bomb
ditched it in the sewer. My moneys on plastic bottle explosive or firework. Both woukd probably be hard to reconstruct in a sewer.

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